Blowpipe.



J; HARRIS.

BLOWPIPE.

APPLICATION FILED APR. 6, 1909.

948,323 Patented Feb. 8, 1910.

2 SHEETS-SHEET 1.

26272665 65 ZFZUCRZW:

% fW aW UNITED STATES PATEN T OFFICE.

BLOWPIPE.

Specification of Letters Patent.

JOHN HARRIS, or CLEVELAND, cnro;

Patented Feb. 8, 1910.

Application filed April 5, 1909. Serial No. 487,883.

ToaZZ whom it may concern:

Be it known that I, JOHN HARRIS, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented acertain new. and useful Improvement in Blowpipes, of which the followin is a full, clear, and exact description, re erence being had to the accomto rovide ablowpipe of this character in which the liability to flash back will not only-be reduced to a minimum, but such immunity from-flashing back will besecured without the necessity of subjecting the acetylene to a pressure greater than that used in generators for ordinary lighting purposes; also to provide a blow pipe of this character with means whereby it may be repeatedlyop erated' after having once been adjusted to the pressures of the gases employed therein without the necessity for adjusting valves; also to provide a blow pi e of this general character with means w ereby, in case a mixture of gas and oxygen should be produced and ignited, the explosion will not be propagated into the apparatus by means of which the pipe is supplied with its gases.

Other objects of my invention are to secure economyof consumption of oxygen, efiiciency of operation, and simplicity of construction.

Generally speaking the invention may be defined as consisting of the combinations of elements embodied in the claims hereto annexed and illustrated in the drawings forming a part hereof, wherein:

igure 1 represents a side elevation of a blow pipe and the supply connections therefor constructed in accordance with my invention; Fig. 2 represents a plan view of the valves for admittin the gases to the blow pipe; Fig. 3, an en ar ed longitudinal sectional view through suc pipe; Fig. .4, a sectional detail on the line .ry looking u ward, and Fig. 5 is a similar viewon t e same line looking downward.

Describing the parts-in connection withreference characters, 1 denotes the blow pipe proper, the same comprising a'casing 2- hav ing its opposite ends internally threaded and each provided with a chamber. The casing 2 is provided with a nozzle 3 carried by a.

web 4:v extending transversely of the casing. This web is provided with an internally threaded bore for the reception of a corre sponding external thread on the nozzle. By this construction, nozzles of varying capacity maybe applied to the web to adapt the blow pipe to varying capacities of flame.

' The nozzle 3 is provided with a bore extending. longitudinally therethrongh. This bore is enlarged at the rear end, as shown at 5, and tapers forwardly, where it merges with the more restricted portion 6, which in turn merges with-the narrowerbore 7 extending throu h the front end of the nozzle. The front en of the nozzle is tapered, as shown,and discharges into a mixing'chamher 8 provided in the casing 2 between the web hand the rear ortion of the'nozzle 9. The rear end of the bore is provided with a slot 5 for the application of a screw driver. The nozzle.9 is preferably threaded into the threaded end of easing 2 and is provided with an elongated mixing bore 10,

extending therethrough, the rear end of such bore being frusto-conical, as shown at 11, communicating with the'mixing chamber 8. The rear end of casing 2 is closed b a plug 12, which is shown as threaded Into said casing and-forms with the rearend'of nozzle 3 a chamber 13. The casing 2 is also provided with an extension 14,'preferabl y integral therewith, and said extension 1s provided with an annular groove 15 inits lower surface. This roove is for the reception of an elon ate casin 16, the upper end whereof is a apted to t within said groove.

17 denotes a plug having a bore 18. therethrough communicating at its upper-end, through a port 19, with the chamber 13.

The upper end of the plug 17 is reduced,

as shown at 20, and provided with a threa on such reduced and whereby it may be fitted into the projection 14. The plug 17 is provided with a centering flan 21, adapted to fit snugly the bore of casing 16, and this.flange is provided with a plurality tank. These valves are connected, as by means of a web 44, which is secured to a common standard 45, as by means of a bolt 46. The valves 42 and 43-will be provided with intermeshing gear segments, 4;? and 48 respectively, and one of said segments will be provided with an operating handle i9. Between each of the valves 42 and 4:3 and its flexible connection leading to the blow pipe there is interposed a check valve 50 and 51 respectively. By means of valves 42 and 43, segments 4:? and 48 and operating handle 49, when once the valves 35 and 37 have been set to secure the proper proportions between the oxygen and acetylene, it will be necessary only for the operator to throw the handle 49 in the proper direction to open and close the valves 42 and 43. No relative adjustment of valves will thereafter be necessary, the operation of the handle 49 controlling the rate of flow of the gases while the valves 35 and 37 will maintain the proportions therebetween.

Should the blow pipe outlet become clogged, or should some other circumstance cause the oxygen to travel back and mix with the acetylene in its conduits and should a leak occur in the conduit containing this mixture, then the escaping mixture might catch fire and an explosion occur within the conduit including the flexible pipe. This explosion will be transmitted backwardly only as far as the check valve in the pipe in which the explosion may occur and no damage will be done to the supply apparatus.

By the construction described herein it will be apparent that I have produced a particularly efiicient form of blow pipe and one wherein the liability of flashing back will be'reduced to a minimum; one which will deliver the acetylene to the blow pipe in such condition as to secure proper and complete combustion thereof, and one which will not only be efficient in operation, but will reduce to a minimum any damage incidental to explosion, should such action occur.

Having thus described my invention, what I claim is:

1. The combination with a blow pipe having a tip and inlet ports, of a casing remote from said tip and communicating with one of said ports, means for supplying gas to said casing, a conduit communicating.

with the other port and located within the casing-and forming therewith a passageway restricted in width to prevent the propagation of fiame'therethrough, and means for supplying gas to said conduit.

2. The combination, with a blow pipe having a tip and inlet ports, of a casing remote from said tip and communicatin with one of said ports, a conduit within said casing and forming therewith a passageway restricted in width to prevent the propathe propagation of flame therethrough, fill-x ing material in said conduit, means for" supplying oxygen to said conduit, and means for supplying acetylene to the annular space between said conduit and casing.

at. The 0mbination, with a blow pipe.

havin a tip and inlet ports, of a casing remote rom said tipand communicating with one of said ports, an elongated conduit within said casing and forming therewith anelonga'ted annular passageway restricted in width to prevent the propa ation of flame therethrou h, a filling 0T pumice stone'in said conduit, means for supplying oxygen to said conduit, and means for supplying acetylene to the annular space be tween said conduit and casin Y 5. The combination, with a %low pipe provided with an inlet projection having a pair of ports and provided with an'annular recess in the outer end thereof, of a casing having an end fitting in said recess and communicating with one of said ports, packing material in said recess, a conduit within said casing forming therewith an annular passageway and communicating with the other port, 'means for supplying gas to said conduit, means for supplying another gas tovthe s ace between said conduit and easing, an means for adjusting said casing to'force the end thereof into said recess.

6. The combination, with a blow pipe provided with an inlet projection having a pair of ports, of a casing having an end fitting said rojection and communicating with one 0 said ports, a conduit within said casing forming therewith a passageway and communicating with the other port, means for supplying gas to said conduit, means for supplying another gas to the space between said conduit and casing, and means for adjusting said casing to form a tight joint with said projection. v

7. The combination, with a blow pipe having a projection provided with a pair I of ports, of a casing carried by said projection and having at the end remote therefrom a closure, said casing communicating .with one of said'ports, a conduit within said casing forming therewith a passage? way and communicating with the other port, said conduit being provided with an &

inlet connection extending through said closure, 2. second connection carried by the closure, and ineans on the first mentioned connection for adjusting the casing toward and from the blow pip 8. The combination, with a blow pipe having a pair of inlet ports, of a casing communicating with one 0;; said ports, a conduit in said casing forming therewith a passageway and communicating with the other port, a plug closing each end of said conduit, each of said plugs being provided with a bore therethrough and each being provided beyond the conduit with a centering flange engaging the casing, each of said flanges eing provided with one or more ports, means for supplying a gas to said conduit, and means for supplying a gas to said casing beyond the flange which is remote from the blow pipe.

9; The combination, wit-h a blow pipe having a pair of gas supply connections,

of a valve for each of said connections, a

valve fitting comprising a pair of valves, flexible pipes extending between the said connections and said fitting, and means whereby the valves in said fitting may be operated simultaneously.

10. The combination, with a blow pipe having a pair of connections and-a valve for each connection, of a valve fitting comprising a pair of valves, intermeshing gears carried by the latter valves, operating means for one of said gears, and flexible pipes connecting the latter valves with the aforesaid connections.

11. The combination, with a blow pipe having a pair of connections and a valve ror each connection, of a valve fitting comprising a pair of valves means for operating said valves, flexible ipes connecting the latter valves with the atoresaid connections,

arenas .having' a pair of supply connections and a valve for each connection, of a valve fitting having a pair of check valves, and

flexiblepipes connecting said check valves with said connections.

14. The combination, with a blow pipe comprising a casing having a pair of lateral inlet ports, of a casing rotatably connected with the former casing and projecting laterally therefrom and provided with a pair of passageways communicating with said ports respectively, connections projecting from the latter casing, and flexible pipes for such connections.

-15. The combination, with a blow pipe provided with an inlet projection having a pair of ports, of a casing connected at one end to said projection and communicating with one of said ports, a conduit within said casing forming therewith a passage way restricted in Width to prevent propagation of flame therethrough and communicating with the other port, means for supplying gas to the restricted space between the conduit and casing, and means ft: supplying another gas to the con r'iait v ithin the casing.

In testimony whereof, I hereunto ailix my signature in the presence of two witnesses.

, JOHN HARRIS. Witnesses:

J. B. HULL,

BRENNAN B. VVEs'r. 

